Dirt 2 is one of the best looking games currently available, especially on PC in DX11 mode if you have the hardware to back it up.
Codemasters has tweaked their EGO engine, and early video footage and screen shots of Dirt 3 indicate that we are in for a treat. Whether or not the screen shots are untouched is impossible to say, but if they are an accurate indication of what to expect from the game which will drop sometime next year, then eye-candy junkies are in for a treat.